Heat olive oil and 1 tbs of butter in a large sauté pan or pot.
Add onion and chopped garlic. Sauté until soft.
Add Italian Seasoning, pepper flakes (of desires) and lightly season with salt and pepper.
Add the vodka and the heat up and boil for 2-3 minutes.
Add the crushed tomatoes and season with salt, pepper and a little more Italian seasoning.
Reduce the heat and simmer for 30 minutes stirring occasionally
Add the heavy cream and parmesan cheese. Simmer for an additional 30 minutes.
Season to taste and add 1 tbs of butter.
Add pasta water to save and serve over prepared penne pasta.
Notes
I don’t like to give measurement for salt and pepper because people have different sensitivities towards that. Also, don’t rush the sauce. It will take a full hour to cook and be worth it!